Due to bug https://bugs.freedesktop.org/show_bug.cgi?id=87412 , no longer duplicate desktop-shell.so , no longer specify to load desktop-shell.so as it is loaded automatically

git-svn-id: https://rebeccablackos.svn.sourceforge.net/svnroot/rebeccablackos@3247 56e3d1a8-0179-4092-b3e2-9fbbcda0c0a9